Sandpaper-cutting machine.



I W. H. HANSGOM L J. S. LARRABEE. SANDPAPER CUTTING MACHINE.

APPLICATION FILED JUNE 3o, 1913.

1 1 20, 1 43. Patented Dec. 8, 1914.

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W. H. HANSGOM lL J. S. LARRABBE. SANDPAPBR CUTTING MACHINE.

APPLICATION FILED JUNE 30.1913.

Patented Dec. 8, 1914.

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W. H. HANSCOM & J. S. LARRABEB.

SANDPAPER CUTTING MACHINE.

APPLICATION num JUNI; 30.1913,

1,120,143. Patented Dec.8,1914.

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WILLIAM H. HANSCOM, 0F HAVERHILL, AND JOHN S. LARRABEE,

or LAWRENCE,

MASSACHUSETTS.

SANDPAPER-CUTTING MACHINE.

Madras.

Specification of Letters .Patent.

Patented Dec. 8, 1914i.

Application filed .Tune 30, 1913. Serial No. 776,539.

To all whom it may concern Be it known that we, VILLIAM H. HAN- scoarand JOHN S. Lannannn, citizens of the United States, residing atHaverhill and at Lawrence, respectively, in the county of Essex andCommonwealth of Massachusetts, have invented a new and useful Sandpaper-Cutting Machine, of which the following is a specification.

The object of our invention is to provide a novel paper cutting machineespecially designed for cutting sand paper; to provide novel means forguiding and measuring the paper prior to cutting; to provide novel,adjustable and effective cutting mechanism; to provide in connectionwith the cutting mechanism novel means for securely holding the paper inposition during the cutting operation; and to provide novel means forsetting the paper guide and measuring mechanism for cutting eithernarrow 0r wide strips.

It is also an object of our invention to provide as the means forholding the paper an automatic device so arranged that it will alwaysgrip the paper when the cutting operation is in progress and release thepaper when the knife is raised.

A further object of our invention is to provide a novel combination andarrangement of parts to afford greater convenience and effectiveness ofoperation in a machine of this character.

`We attain these objects by the mechanism illustrated in theaccompanyingr drawings, which form a part of this specification, and inwhich- Figure l is a top plan of the entire machine; Fig. 2 is a frontview showing the arrangement of the rolls and with the knife in raisedposition; Fig. 3 is a side view of the entire machine showing the knifelowered as it completes the cutting operation; Fig. i is a verticalsection of the knife blades, knife holder and bed of the machine; Fig. 5is a detail cross sectional view of the upper knife and means foradjusting it.

Like characters of reference indicate like parts throughout the severalviews.

Our sand paper cutting machine has a bed 1, provided with roll supports2, the latter having recessed portions 3, in which are remo ably mountedroll-holding rods 4, which support rolls of sand paper indicated by theletter S. Secured to opposite sides of the bed 1, there are providedside plates 6, in which are mounted a paper guide rod 5 extending acrossthe bed of the machine to guide the paper as it is unrolled.

The paper cutting mechanism comprises a lower knife 20, secured to bed1, having its cutting edge substantially in alinement with the bed, asillustrated in Fig. 4, and an upper knife, 9, secured to a knife holder7 and thus pivotally mounted by means of knife-head piece 8 to knifebracket 29, which is secured to the side of the bed 1. as shown. Knife20 has a transversely diagonal concave edge surface 2l, and knife 9 hasa similar' transversely diagonal concave edge surface 10. rl`hetransversely diagonal concave knife edges prevent the grit from crushingunder the knives during the cutting operation. As a means for adjustingthe lower` knife 2O we provide adjusting screws 22; and for adjustingthe upper knife 9, we provide adjusting screws 23, in order that theknives may be so adjusted as to prevent the paper from wedging inbetween them and so that they will cut a smooth and straight edge. Upperknife 9 is fastened to knife holder 7 by screws Q4.

Automatic paper-holding mechanism is provided for holding the paperduring the cutting operation and releasing it when the upper knife 9 israised at the conclusion of the cutting off of a strip. This mechanismcomprises one or more presser feet 12, slidably mounted in a suitablepresser foot holder 11, the latter member being adjustably `mounted onthe knife holder 7, as shown in the drawings. Presser' feet 19. areyieldingly held in their lowest or normal position by springs 13,arranged preferably as illustrated.

Paper measuring mechanism is provided for measuring strips of suitablewidth to be cut from the roll. Rules QG are provided,

mounted in the bed l of the machine and positioned preferably asillustrated in Fig. 1, or otherwise suitably positioned for use inconnection with our measuring `member 19,

which is provided at its ends with toothed bars or racks 18, adapted toengage with corresponding pinions 17, mounted on a suitable rod 14, andwhich is supported by rod supports 28, suitably secured to the bed orside plates of the machine, as illustrated in the drawings. Rod 14 isprovided at one of its ends with hand wheel 15, as illustrated in F ig.1, and at the reverse end with locking nut 16. When it is desired tomeasure off wide instead of narrow strips of sand paper for cutting, wemay also provide supports 27, positioned substantially as illustrated inFigs. 1 and 8. lt is also within the contemplation of our invention toarrange or construct rod supports 28 so as to be removably secured tothe bed of the machine in both the position they occupy in the drawingsand' in the position occupied by supports 27, for convenience inchanging the position of measuring member 19 and the means for operatingit, according as narrow or wide strips are desired. Rod supports 28 maybe of any suitable construction, their primary function being to supportrod 1li.

25 indicates a recess extending across the bed of the machine, for theupper knife 9 and knife holder 7 to operate in during the cuttingoperation, as illustrated in Fig.

Provision is made for the holding of a plurality of sand paper rolls inroll supports 2 in order that different kinds or grades of sand papermay be conveniently available, as, for example, .#80 grit, .tt-70 gritand #120 grit.

In operation, the end of a roll of sandpaper is unwound, drawn underguide rod 5, and its edge brought into abutment against measuring member19, which, operated by hand wheel 15, rod le, pinions 17 and racks 18,may be set at the desired distance on rule 26 from the fined lower knife20. The upper knife 9, secured to knife holder 7 which has been raised,is then brought down with a cross shearing motion which gives a goodclean cut, the transversely diagonal concave ground cutting surfaces ofboth knife blades avoiding the crushing lof grit on the paper, andmaking an effective cutting mechanism for theV purpose intended. As theknife 'enters the paper, the presserfoot (or presser feet, successively,as the case may be)V presses upon the paper and holds it firmly duringthe cutting operation, and releases the paper when the upper knife isagain raised. The springs 13, as will be understood from the drawings,give the desired tension to the presser foot 12, which is slidable inpresser foot holder 11.

The measuring member 19 when in the position illustrated in F ig. l iscapable of adjustment to and from the edge of lower knife 20,sufhciently for measuring narrow strips, and when it is desired to cutwide strips it is operated from the supports 27. Locking nut 16, as willbe understood from the drawings, serves to fasten the measuring member19 in a fixed position when desired. W hen desired, the locking nut maybe unscreived, rod la withdrawn from rod supports 28 and the mechanismassembled in operative' position mounted in supports 27,

the latter having a like function to that of rod supports 28.

lt is understood that it is within the contemple/tion of our'inventionto cast parts integrally or separate, as may be desired; and wepreferably provide a frame or bed with knife holder l racket and rodsupports cast as one. y

It is Within the contemplation of our invention to reverse thepositioning of the knife blades and knife holding members relative tothe bed members to` which they are attached. it is also l surface of thelower knife blade and the paper held against slipping as herein setforth. lt is also essential for sandpaper cutting that the blades haveconcave diagonal edge surfaces to avoid drilling.

What we claim is:

1. ln a machine of the class described, the combination of means forsupporting one or more sandpaper rolls, cutting -nechanism comprising anadjustable stationary knife and an adjustable swinging knife, and

means adjustably mounted on the knife holder for yieldingly pressingdown upon the sand paperduring the cutting operation and releasing thepressure when the swinging knife is raised, the aforesaid means beingpositioned to press upon the sand paper at portions spaced substantiallyapart from the edge of the blade to arch the sandpaper over the knifeedge surface, whereby to prevent the sandpaper from dulling t-..e knifeblade;

2. In a sandpaper cutting machine, the combination with a paper cuttingmachine of measuring mechanism comprising a bed having one or morerules, a measuring member slidable on the bed and disposed parallel withthe cutting mechanism, to form an abutting surface for the edge Vof thesand paper, toothed bars mounted on the ends of the measuring member,said bars being of a length substantially equal to the width of themeasuring member, pinions meshing with the aforesaid bars, a red onwhich the pinions are mounted, supports for the rod, a hand wheelsecured to the rod at one end for adjusting Athe measuring mechanism inthe desired position, and a locking nut at the opposite end of the rodfor locking the measuring mechanism :in any desired position.

3. In a sand paper cutting machine, the combination of a bed, meansmounted thereon for holding one or more sand paper rolls, a stationaryknife blade, .means `for its lateral oblique adjustment and attachmentto the bed of the machine in substantial alinement therewith, and aswinging knife pivotally attached to the bed and having an obliquelyadjustable blade member, the blade members having concave edge surfaces,whereby sandpaper may be severed with the least possible chilling ofcutting edges.

4. In a machine of the class described, the combination of a bed, anobiiquely-adjustable stationary lower knife secured to the bed, a knifeholder pivotally mounted to one side of the bed, an obliquely adjustableupper knife mounted in the knife holder, the aforesaid knives havingconcave edge surfaces and being diagonally shaped to provide a cuttingmechanism with nonparallel surfaces to prevent crushing of grit, andresilient paper-holding mechanism adj ustably mounted on the machine andpositioned to engage the paper at points spaced substantially apart fromthe knife blade.

5. In a machine of the class described, the combination of a bed, meansfor holding one or more rolls of paper mounted thereon, an obliquelypositioned lower knife having a transversely diagonal concave edgesurface, means for securing the aforesaid knife to the bed of themachine and for its oblique lateral adjustment, a. knife holder mountedat one side of the bed of the machine, an obliquely adjustable upperknife having a transversely diagonal concave edge surface mounted in theknife holder, means for attaching the upper knife to the holder and forits oblique lateral adjustment, and paper-holding means engageable withthe sand paper at points spacedsubstantially apart from the cutting edgeof the knives and arranged to operate only during the cutting operation.

6. In a machine of the class described, the combination of a bed, meansfor holding one or more rolls of paper mounted thereon, a stationarylaterally adjustable lower knife secured to the bed of the machine. aradially-movable knife holder mounted on the bed of the machine andhaving a laterally adjustable upper knife secured thereto, the aforesaidknives being shaped and positioned to coperate in cutting sand paperwithout crushing the grit, means for guiding the paper prior to thecutting operation, means including a fixed rule and a movable measuringmember and rack and pinion actuating mechanism for measuring strips ofany desired width to be severed from a roll, means for adjusting theaforesaid measuring means, and a plurality of sets of opposite supportspositioned in spaced relation relative to the knife mechanism, for thepurposes specified.

7. In combination with a paper cutting machine of the characterdescribed, a pivotally mounted knife holder and upper knife having oneor more automatic paper-holding mechanisms adjustably secured to theknife holder, comprising a presser foot holder, a presser foot membervertically slidable in the aforesaid holder and spaced substantiallyapart from the knife blade, and resilient means attached to the presserfoot holder and presser foot member for yieldingly pressing the presserfoot member downward to engage with and hold the strip of paper to besevered during the cutting operation, the presser foot being positionedto contact with the paper at a point beyond the edge surface of a lowerknife blade to arch the paper and obviate dulling of the knife edge.

8. In a machine of the class described, the combination of means forsupporting a plurality of sand paper rolls, a bed having a recessextending across the machine through which narrow sand paper strips mayfall when severed, paper-measuring members on the bed of the machine, anobliquely-positioned adjustable lower knife blade secured to therecessed portion of the bed, a swinging upper knife having anobliquely-adjustable knife blade mounted thereon, andadjustably-mounted, yielding presser foot mechanism spaced substantiallyapart from said upper knife blade to hold the sandpaper during thecutting operation in position to prevent rubbing of grit on the edge ofthe knife blades, substantially as set forth.

9. In a sand paper cutting machine, the combination of a bed having arecess extending across the machine through which sandpaper strips mayfall when severed, means for measuring the paper strips on the bed ofthe machine prior to cutting, means for holding one or more rolls ofpaper on the machine, an obliquelyadjustable lower knife bladeadjustably attached to the recessed portion of the bed, apivotally-swinging knife holder having an obliquely adjustable upperknife blade adjustably attached thereto, said knife blade being taperedto eut a smooth edge and prevent crushing of grit, and yielding presserfoot n'testmony whereof We afX our signamechansm longitudinallyadjustable relatures.

tive t0 the knife holder and removed from WLLIAM H. HANSCOM. the cuttingedge of the knife to Contact with JOHN S. LARRABEE.

the sandpaper at a point or points at such ltnesses:

distance from the cutting edge as to pre- CHARLES R. NEWCOMB,

Vent grit from dullng the knives. EDWARD R. HALE.

Copies of this patent may be obtained for ve cents each. by addressingthe Commissioner of Patents,

Washington, ID.

